Method and apparatus for transmitting and receiving...

H - Electricity – 04 – L

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H04L 9/12 (2006.01) H04N 7/16 (2006.01) H04N 7/167 (2006.01) H04N 7/169 (2006.01)

Patent

CA 2187313

An encrypted signal compatible with first and second encryption systems is generated by producing encryption data signals relating to each encryption system. A difference signal is derived from the two encryption data signals and the signal to be encrypted is encrypted in accordance with one of the encryption systems. At an output the encrypted signal, the two encryption signals, and the difference signal are made available. At a decoder compatible with, for example, the first encryption system, the encrypted data, the second encryption data signal, and the different signal are received. The decoder can then derive the first encryption data signal from the second encryption data signal and the difference signal and can then decode the encrypted signal.

Un signal crypté, compatible avec un premier et un second système de cryptage, est généré par production de signaux de données de cryptage se rapportant à chacun des systèmes de cryptage. Un signal différence est dérivé des signaux de données de cryptage, le signal à crypter l'étant conformément aux systèmes de cryptage. Au niveau d'une sortie, le signal crypté, les deux signaux de cryptage ainsi que le signal différence sont rendus disponibles. Au niveau d'un décodeur compatible avec par exemple le premier système de cryptage, les données cryptées, le second signal de données de cryptage ainsi que le signal différence sont reçus. Ce décodeur peut ensuite dériver le premier signal de données de cryptage du second ainsi que du signal différence et il peut ensuite décoder le signal crypté.

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